Clamping device for cylinder boring machines



' c. o. HANE 2,039,715

CLAMPING DEVICE FOR CYLINDER BORING MACHINES I Filed Deci. 9, 1935 2 Sheets-Sheet l y 1933- c. o. HANE 2,039,?15

CLAMPING DEVICE FOR CYLINDER BORING MACHINES Filed Dec. 9, 1955 2 Sheets-She a 2 Patented May 5, 1936 UNITED STATES PATENT OFFICE CLAMPING DEVICE FOR CYLINDER BORING MACHINES of Minnesota Application December 9, 1935, Serial No. 53,444

12 Claims.

This invention has for its object the provision of a simple and highly eflicient clamping device especially adapted for clamping cylinder boring machines to the blocks of multi-cylinder engines,

and generally stated, the invention consists of the novel devices, combinations of devices, and arrangement of parts hereinafter described and defined in the claims.

A device of this character must comprise an anchor insertable through a cylinder other than the one being bored and operative in combination with a co-operating tension-applying means to firmly clamp the boring machine in position for boring a cylinder other than the one through which the anchor of the clamping device is applied. The anchor is made vertically adjustable to adapt itself to the depth or length of the cylinder block and preferably means is provided for temporarily holding the anchor in position prior to the coupling thereto of the tension-applying device.

A commercial form of the device is illustrated in the accompanying drawings, wherein like characters indicate like parts throughout the several views.

Referring to the drawings:

Fig. 1 is a view partly in elevation and partly in vertical section showing the complete cylinder anchoring device applied to rigidly secure a cylinder boring machine to the block of a multicylinder engine;

Fig. 2 is a view chiefly in side elevation but with the cylinder block sectioned in a plane at right angles to the plane in which the cylinder block is sectioned in Fig. l;

Fig. 3 is a plan View of the tension-applying device or part of the complete anchoring device;

Fig. 4 is a section taken on the line 44 of Fig. 3.;

Fig. 5 is a section taken on the line 55 of Fig. 3,, some parts being removed;

Fig. 6 is a detail showing the crank end of a crank-shaft that forms part of the tension-applying means and showing also a coupling link hung therefrom; and

Fig. 7 is a plan view of the fork used to temporarily hold the anchor proper in working position or positioned for coupling thereto of the tension-applying means.

50 The cylinder block is indicated as an entirety by the numeral 8. Of the parts of the cylinder boring machine the numeral 9 indicates the frame and the numeral Ill the boring bar. The frame 9 is shown as provided with a laterally 55 offset base portion II that has upstanding parallel flanges Ila and depending parallel flanges l lb, which latter are formed with long clearance slots or passages No. In practice the boring bar l0 will, through mechanism not shown, be preferably driven from an electric motor, the frame I2 of which is. mounted on the upstanding flanges lid, and hence, is raised above the horizontal plate of the base portion ll and which latter, it may be here noted, is provided with a large central passag l3 and pin seat I4. 10

The anchor proper of this clamping device is preferably made up of three elements, to wit: an internally threaded shank [5, a screw-threaded rod [6, and a cross-bar H. The rod l6 has screwthreaded engagement with the shank l5 and at 15 its lower end has a head l8 formed with an outstanding peripheral flange l9 and with an upstanding coupling ear 20, which latter is perforated for the application therethrough of a coupling pin 2| that is adapted to be applied as 20 presently to be described. The shank l5, at its lower end, is bifurcated or formed with depending laterally spaced ears between which the cross-bar I1 is placed and to which said crossbar is pivotally connected by a pin or preferably 5 threaded bolt 22. The ears or shank are shown as provided with vertically spaced bolt passages 23 which adapt the cross-bar to be set lower down or higher up on the shank. Also shown the cross-bar H at lower edges, as shown in the 30 drawings, is beveled so that the said cross-bar is made reversible to bring either its straight or beveled edges in engagement with the bottom of the cylinder block, according to which edge best fits the lower end of the cylinder. 35

The upper portion of the complete clamping device'is in the form of a clamping frame 24, preferably of plate-like form, provided at one end with a bearing lug 25 and having a large longitudinal slot 26 that affords a guide for a 40 sliding block or cross-head 21, see particularly Figs. 3, 4 and 5. At its lug-equipped end the frame 24 is provided with vertically disposed adjusting screws 28 and at its opposite end with depending bearing lugs 29. Extended through and mounted in the bearing lug 25 for rotary and endwise sliding movement is a shaft 30 provided at its inner end with an eccentric portion 3|. By reference to Figs. 4 and 5 it will be noted that the cross-head block 21 is notched at its lower corners so that it rides on the bottom of the frame 24 and is guided by the slot 26 thereof. The frame 24 has a depending dowel or pivot pin 24a loosely seated in the pin seat M of the base ll.

Loosely hung on the eccentric en 3| of the crankshaft 30 is a coupling link 32, the lower end of which is bifurcated to provide prongs adapted to straddle the ear 20 of the anchor proper. The depending ears of this coupling link are perforated so that the coupling rod 2| may be passed therethrough as well as through the perforation of the lug 20 when the perforations of said elements are aligned, as shown in Figs. 1, 2 and 4. Here it should be noted that the coupling pin 2| is passed freely through the slot I la of the base flange l l and does not contact with the base when tension is applied to the'anchor. The link 32 is shown as held on the crank end 3| by a cotter 33 and the cross-head block 21 is held for sliding movements with the eccentric shaft 30 by the upper end of the link 32 and a radial projecting lug or portion 34 carried by saidshaft 30. This projection 34 also serves to limit the rotary movements of the eccentric shaft for it is arranged to move only between stoppins orprojections 35 and 36 on the cross-head block 21.. At its outer end the crank-shaft 30 is shown as provided with radial perforations 31 through which the end of an operating rod or handle 38 is adapted to be passed. The fork 39 for temporarily holding the anchor in position is indicated in plan view in Fig. 7 and in section in Fig. 2. 7

First, the anchoring device proper. will be dropped down through the cylinder other than the one to be bored and its cross-bar I1 is engaged with the bottom of the cylinder block, .and then this. anchoring device proper will be temporarily held in position by the use of the fork 39, shown in Fig. 7, and which latter will be slid over the top of the cylinder block to straddle the hub l8 immediately under the flange I 9 with the ends of said fork resting on the top of the cylinder block. Before the anchor is temporarily applied, as just described, it should be longitudinally adjusted to substantially the proper length. 7 V

The clamping frame 24 will be placed on the horizontal plate of the base II and positioned so as to'bring the lugs of the coupling link 32 and ':the lug 20 of the anchoring device intoalignment and the coupling pin 2| will then be inserted through the aligned perforations of said lugs.

Next, by adjustment of the screws 28 and. while the crank or eccentric rod is turned in a counterclock direction as far as it will go and at which time the coupling link will be lowered as far as it will go, thescrews 28 will be adjusted so as to take up all of the slack in the complete coupling devicebetween the bars I! and the clamping frame. At'the time just stated, the stop lug 34 will be engaged with the left-hand stop lug 35.

32and on the anchor and clamps the base of the boring tool to the top of the cylinder block with a very great pressure. This clockwise movement of the crank-shaft imparts but comparatively small amount of movement to the anchoring devices but puts the clamping device under a very high tension and will sosecurely anchor the boring tool to the cylinder block that there is no possibility of the boring tool getting out of position during the boring action. Here it is important to note that when the crank-shaft is moved to its high tension position, just stated,

the clamping action by a reverse of counter-clockwise movement and, moreover, it is impossible for the crank-shaft to move to a releasing position by continued movement in a clockwise direction because the engagement of the stops 34 and 36 positively prevents such movement. Of course, release of the device is quickly accomplished by rotation of the crank-shaft from its clamping position in a counter-clockwise position back to its releasing position.

In practice it will be the usual practice to put the clamping device under light tension as by slightly tightening said screws 28, while the boring machine is being set to final and accurate position, and to complete the application of the clamping power, by rotation of the crank-shaft to complete the clamping of the boring machine on the cylinder block.

The clamping frame 24 is capable of lateral pivotal adjustments on the pivot pin 24. The link 32, and hence the anchoring device, are shiftable by axial movements of shaft 30. This compound movement makes it an. easy matter to set the anchoring device at the axis of the cylinder through a which it has been inserted. 7

In actual practice this clamping device has been found highly efiioient for the purpose had in View and one that can be easily applied and operated. It will, of course, be understood that the commercial form of the device illustrated is catom of a cylinder other than the one to be rebored,

a clamping frame mounted on the base of said reboring tool, means for'vertically adjusting the said clamping frame on said base, a crank shaft mounted on said clamping frame, a link suspended from the crank of said shaft, and means for coupling the said link to said anchor, the vertical adjustment of said clamping frame serving to take up play and initially apply said anchor, rotation of said crank shaft serving to apply the final pressure to said anchor and base.

2. The structure defined in claim 1 in which said clamping frame is laterally adjustable on said base.

3. The structure defined in claim 1 in which said crank shaft is axially adjustable on said clamping frame.

4. The structure defined in claim 1 in which said clamping frame is laterally adjustable on said base, and said crank shaft is axially adjust- .able on said clamping frame.

5. The combination with a cylinder reboring tool having an extended base, of an anchor insertable through and engageable with the bottom of a cylinder other than the one to be rebored, a clamping frame mounted on the base of said reboring tool, means for vertically adjusting the said clamping frame on said base, a crank shaft mounted on said clamping frame, a link suspended from the crank of said shaft, said link and anchor having pin passages adapted to be aligned, and a coupling pin insertable through the coincident pin passages of said link and anchor, the vertical adjustment of said clamping frame serving to apply initial anchoring pressure, .and rotation of said crank shaft serving to apply final clamping pressure to said anchor and base.

6. The structure defined in claim 5 in which said clamping frame is mounted for lateral angular adjustments.

7. The structure defined in claim 5 in which said crank shaft is mounted for axial adjustments on said clamping frame.

8. The structure defined in claim 5 in which said clamping frame is mounted for lateral adjustments on said base and said crank shaft is mounted on axial adjustments on said clamping frame.

9. The structure defined in claim 1 in which said crank shaft is limited to a clamping movement that is slightly beyond a dead center.

10. The structure defined in claim 5 in which said crank shaft is limited to a clamping movement that is slightly beyond a dead center.

11. The structure defined in claim 1 in which said clamping frame is pivoted to said base for lateral adjustments and is also mounted for vertical adjustments.

12. The structure defined in claim 5 in which said clamping frame is provided with a slidable cross-head block in which the inner end of said shaft is journalled for sliding movements therewith and with said link.

CARL O. HANE. 

